feat(golang-rewrite): update asdf plugin test command to install a …

…tool version in the test

cli/cli.go

@@ -840,7 +840,7 @@ func pluginUpdateCommand(cCtx *cli.Context, logger *log.Logger, pluginName, ref
 	return err
 }
 
-func pluginTestCommand(l *log.Logger, args []string, _, _ string) {
+func pluginTestCommand(l *log.Logger, args []string, toolVersion, _ string) {
 	conf, err := config.LoadConfig()
 	if err != nil {
 		l.Printf("error loading config: %s", err)
@@ -921,9 +921,21 @@ func pluginTestCommand(l *log.Logger, args []string, _, _ string) {
 		failTest(l, "Unable to list available versions")
 	}
 
-	if len(strings.Split(output.String(), " ")) < 1 {
+	allVersions := strings.Fields(output.String())
+	if len(allVersions) < 1 {
 		failTest(l, "list-all did not return any version")
 	}
+
+	// grab first version returned by list-all callback if no version provided as
+	// a CLI argument
+	if toolVersion == "" {
+		toolVersion = allVersions[0]
+	}
+
+	err = versions.InstallOneVersion(conf, plugin, toolVersion, false, os.Stdout, os.Stderr)
+	if err != nil {
+		failTest(l, "install exited with an error")
+	}
 }
 
 func failTest(logger *log.Logger, msg string) {